Pitch (a product of coal tar distillation) is always mixed with creosote oil, when it is to be burnt in a burner, because

• A. its calorific value is very less.
• B. tar neutralises the residual acids present in pitch.
• C. it reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop.
• D. all (a), (b) and (c).